HSTS Preload List Submission

A web tool to check a domain's HSTS preload status and submit it for inclusion.

FreeProprietaryWeb

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About HSTS Preload List Submission

hstspreload.org checks whether a domain is on the HSTS preload list maintained by Chromium and lets you submit a domain for inclusion or removal. Preloaded domains are forced to HTTPS by browsers before the first visit, which protects against protocol downgrades, cookie hijacking and history leaks by an on-path attacker.

The site checks that the domain meets the requirements, such as sending a suitable Strict-Transport-Security header, and documents deployment recommendations. Its source is published on GitHub.

Strengths

  • Official submission route for the Chromium preload list
  • Checks the domain against preload requirements
  • Clear documentation on HSTS deployment

Limitations

  • Preloading is hard to undo quickly, so mistakes can lock out HTTP subdomains
  • Only concerns HSTS, not other headers

Details

Pricing
FreeFree to check and submit domains.
License
Proprietary
Developer
The Chromium Project
Platforms
Web
How it runs
Web application
Works offline
No
Best suited for
Site owners ready to commit a domain to HTTPS-only in browsers
Last verified
Added
Provenance
Selected from the TechWalrus Resource Hub (Website Checkers & Audit Tools); facts checked against the developer's own pages, 2 sources on file.

Report a wrong fact or a dead link on this listing